PRODUCT IDENTIFICATION

256.30

CLASSIFICATION

PHYSICAL AND CHEMICAL PROPERTIES

1.2

GENERAL DESCRIPTION & APPLICATIONS

• Peroxides including hydroperoxides (tertiary-butyl hydroperoxide, benzoylperoxide)
• Azocompound thermal initiators (azoisobutyronitrile)
• Redoxinitiators (mixture of iron(III) acetylacetonate): free radicals are formed by one-electron transferreactions. Useful in low temperature and emulsion polymerization
• Photoinitiators (benzoin, benzil dimethylketal)

The main advantage of polymerization started by photoinitiators is temperature-independence and easy control. It can be conducted at very low temperatures and can be stopped simply by removing the light source. Photoinitiators are compounds that break down into free radicals upon exposure to ultraviolet radiation. Photoinitiators undergo a unimolecular bond cleavage upon irradiation to yield free radicals (benzoin esters; benzil ketals; alpha-dialkoxy acetophenones; alpha-hydroxy-alkylphenones; alpha-amino alkyl- phosphine; acylphosphine oxides). Another type of photoinitiators undergo a bimolecular reaction where the excited state of the photoinitiator interacts with a second molecule (a coinitiator) to generate free radicals(benzo phenones,amines; thioxanthones,amines; titanocenes). Photoinitiators are widely applied in UV curing inks, wood coatings, paper coatings, optical fiber, PCB, screen printing , paper varnish and other surface coatings.

APPEARANCE

ASSAY

99.5% min

MOISTURE

0.1% max

VOLATILES

0.2% max

HEAVY METALS

50ppm max

CLARITY OF SOLUITON

Clear ( 10g in 100ml toluene)

BENZIL

0.1% max

TRANSMITTANCE

95% min (425nm) , 98% min (500nm)

0.1% max

PRICES